The measure of BDA is 40 degrees
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A right angle is exactly 90 degrees.
Thus, your answer is option D
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150
explain:
100/28*42=x which turns into x=150
So the trapezoid has 2 parallel sides making segments AD and BC transversals
Therefore making angle c and angle b add up to 180
(180-3x) + 3x + 180-9x +9x
180 +12x = 360
180= 12x
x= 15
